I tried to set a background for any object type which are supported by this attribute, but failed, it works with solid colors only.
I explored Style Sheet example and tried to apply any part of the code taken from Style Editor window, no luck.
At first I thought that I messed up with resources and a path for the image file, but I'm sure doing right.
It looks that Qt Designer just doesn't display the style, until it would be put into the application
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